Magnetic results, by J. P. Ault. Atmospheric-electric results, by J. P. Ault and S. J. Mauchly.Special reports: The Hudson Bay expedition, 1914, by W. J. Peters. Navigation of aircraft by astronomical methods, by J. P. Ault. The compass-variometer, by Louis A. Bauer, W. J. Peters, and J. A. Fleming. The sunspot and annual variations of atmospheric electricity with special reference to the Carnegie observations, 1915-1921, by Louis A. Bauer. Studies in atmospheric electricity based on observations made on the Carnegie, 1915-1921, by S. J. Mauchly.Carnegie Institution of Washington publication 175, vol. V"Researches of the Department of Terrestrial Magnetism, vol. V"
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